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Numerical simulation of the effect of the stiffness of lamina propria on the self-sustained oscillation of the vocal folds.

Autoři: Hájek P., Švancara P., Horáček J., Švec J.G.Publikováno : In: Zolotarev I., Radolf V. (eds.), Proceedings of the Engineering Mechanics 2016. 22nd International Conference on Engineering Mechanics, 182-185, Academy of Sciences of the Czech Republic, Institute of Thermomechanics, PragueRok: 2016

A two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during selfsustained oscillation of the human vocal folds (VF) is presented in this paper. The aim is to analyze the effect of stiffness of lamina propria on VF vibrations. Such stiffness change can be caused by some VF pathologies. The developed FE model consists of the FE models of the VF, trachea and a simplified human vocal tract. The vocal tract model shaped for simulation of phonation of Czech vowel [a:] was created by converting data from the magnetic resonance images (MRI). The developed FE model includes VF contact, large deformations of the VF tissue, fluid-structure interaction (FSI), moving boundary of the fluid mesh (Arbitrary Lagrangian-Eulerian (ALE) approach), airflow separation during the glottis closure and solution of unsteady viscous compressible airflow described by the Navier-Stokes equations. The numerical simulations showed that higher values of lamina propria Young's modulus (stiffer lamina propria) result in a decrease of the maximum glottis opening. Stiffer lamina propria also requires the use of higher subglottal pressure to initiate self-sustained vibration of the VF.

Katedra biofyziky

Přírodovědecká fakulta

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